The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. Hence, the quantity of mass is "conserved" over time.
The law implies that Alts can neither be created nor destroyed, although they may be rearranged in space, or the entities associated with them may be changed in form, as for example when light or physical work is transformed into particles that contribute the same alts to the system as the light or work had contributed.
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